WO1998032214A1 - Commande du demarrage et du fonctionnement d'un moteur synchrone monophase a rotor a aimantation permanente, y compris en cas de panne - Google Patents
Commande du demarrage et du fonctionnement d'un moteur synchrone monophase a rotor a aimantation permanente, y compris en cas de panne Download PDFInfo
- Publication number
- WO1998032214A1 WO1998032214A1 PCT/DE1998/000172 DE9800172W WO9832214A1 WO 1998032214 A1 WO1998032214 A1 WO 1998032214A1 DE 9800172 W DE9800172 W DE 9800172W WO 9832214 A1 WO9832214 A1 WO 9832214A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- phase
- rotor
- magnetic field
- delay time
- Prior art date
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000005347 demagnetization Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000009795 derivation Methods 0.000 abstract 1
- 230000002123 temporal effect Effects 0.000 abstract 1
- 239000013598 vector Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/46—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor
- H02P1/465—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor for starting an individual single-phase synchronous motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/26—Arrangements for controlling single phase motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
Definitions
- the invention relates to the control of the start-up and operation of a single-phase synchronous motor with a permanent magnetic rotor, taking into account accidents and the permissible demagnetizing current according to the preamble of claim 1, in particular for driving the circulation pump of dishwashers and the compressor of refrigerators.
- the locked position of the rotor is the position of the rotor in which its magnetic field, without additional current supply, has the lowest energy content and in which it stops when there are no frictional influences.
- One measure to bring the power of such a motor to over 30W can be, for example, a special coupling between the motor and the pump, the pump then also having a special design, but the start-up is purely passive without additional electronic aids.
- Alternating voltage source switched stator winding a sensor for measuring the magnetic field of the stator, preferably a Hall sensor, a sensor for measuring the current, a sensor for measuring the supply voltage, an electronic switch, preferably one that goes into the blocking state (e.g. triac) when the current passes zero and one electronic circuit that links the signals from the sensors and controls the switch accordingly.
- a sensor for measuring the magnetic field of the stator preferably a Hall sensor
- a sensor for measuring the current a sensor for measuring the supply voltage
- an electronic switch preferably one that goes into the blocking state (e.g. triac) when the current passes zero and one electronic circuit that links the signals from the sensors and controls the switch accordingly.
- means for phase control of the supply voltage are released in accordance with the polarity of the magnetic field sensor and the desired direction of rotation and the electronic switch is switched after a delay time in this device, so that a driving torque in the desired direction of rotation then results.
- time segments for the release of the means for phase control are determined from the amount and the slope of the signal of the magnetic field sensor, and the AC voltage is switched on after a delay time.
- the direction that starts well is that in which the flux vector of the rotor magnet (see FIG. 1) is directed in the opposite direction to the flux vector of the stator. He can then record almost over 180 ° speed and overcome the dead center, in which the flux vectors of the rotor and stator are parallel. In the other direction, the angle to the dead center is only a few degrees, and accordingly the possibility of overcoming the dead center is poor.
- This method may require a current that at least partially demagnetizes the permanent magnet.
- a disadvantage of the device mentioned is that it does not have a device which limits the current in these hazardous areas.
- Time segments imply the use of time elements, e.g. Timers that, however, no longer synchronize with the rotor rotation when the motor accelerates or decelerates, leading to ignition errors that can cause the motor to brake or, what is worse, increase the risk of demagnetization.
- time elements e.g. Timers that, however, no longer synchronize with the rotor rotation when the motor accelerates or decelerates, leading to ignition errors that can cause the motor to brake or, what is worse, increase the risk of demagnetization.
- the invention has for its object to avoid these disadvantages at the lowest cost and the single-phase synchronous motor insensitive to load variations and disturbances such as Block, overload or make overspeed.
- the load on the motor is to be determined in a simple manner for superordinate control purposes. It should be noted that the load on the engine and
- Hall sensors in the lower price range in addition to large offset voltages, also have a strong temperature drift in the offset voltage and sensitivity. Together with the scatter of the characteristic values of the magnet system, this can lead to signal variations up to a factor of 3 from motor to motor.
- ASICs in the lower price range also have a very limited computing power, which severely limits the permissible effort for sequence and control operations.
- the means for igniting the stator current are released when the amplitude of the sensor signal results from the measurement of the magnetic field is within predetermined ignition limits in the form of amplitude values and the polarity of the alternating voltage half-wave generates a current which gives a driving torque.
- the firing limits are two angles that are located so that the maximum of the Current pulse generated field taking into account the speed and the current build-up occurs when the magnetization vector of the rotor is in quadrants I, II or III, IV (see. Fig. 1 or 2), in which the stator current has a driving effect.
- the procedure according to the invention has the advantage that the ignition conditions are checked at the time of the potential ignition and not at the beginning of the delay time.
- ignition limits are advantageously standardized with the peak value of the magnetic field signal in order to eliminate the signal fluctuations due to scatter and temperature drifts of the magnetic field sensor and the magnetic field system of the rotor.
- the limits are preferably set continuously in the run-up and synchronous operation according to the speed.
- the rotor has not started. In this case, the direction of rotation of the motor is rotated and, starting with the start delay, the supply voltage is switched back to the stator winding until the permissible peak current is reached or the motor has started. This process is repeated until the rotor has rotated until the predetermined value of the magnetic field sensor is reached.
- the advantage of this method is that the start-up process is also very safe and in a very short time There is friction in the direction in which the rotor starts up well and, if the rotor shaft is stuck in the bearings, as could possibly be the case with a long standstill, the hammering force is released by the pulsating drive torque, which changes at short intervals.
- the delay time which was determined during the starting process at the maximum permissible current, serves as the starting time for the extended delay time.
- a limit value is calculated to determine whether the maximum of the current falls within the angular range in which the rotor can be demagnetized. B. is determined in every half rotation of the rotor, which takes into account the build-up time of the current and the rotor speed and is standardized with the maximum of the signal from the magnetic field sensor. If the measured magnetic field sensor signal is above the calculated limit value, it is not necessary that the delay time (additional delay time) be extended.
- step means that the rotor of the motor no longer runs synchronously with the mains frequency.
- a special case of overload is a blockage of the motor, for example due to foreign objects entering the pump.
- a wing of the pump impeller strikes the solid body.
- the pump impeller is thrown back.
- a wing of the impeller strikes the solid again when it is turned back.
- the possible angle that the impeller can make is usually in the order of a wing pitch of the impeller, but in any case well below 360 °.
- a maximum of Magnetic field signal less than the maxima of the magnetic field signal in normal operation.
- Magnetic field amplitude falls below a predefined value.
- the peak value of the current evaluated with the phase angle between the current and the magnetic field of the rotor, is used as a measure of the motor power. If this is not the case, then in the simplest case that only the value falls below this limit value, it has proven to be advantageous to use the resulting, to some extent, constant change between the control laws of synchronous and start-up.
- Fig. 1 single-phase synchronous motor with sensors and hardware part of the control with indication of the rest positions, caused by the formation of the air gap
- Fig. 2 single-phase synchronous motor with locking positions, caused by an additional magnet
- Fig. 1 is an embodiment of the invention
- the single-phase synchronous motor (1) comprises a stator (2), on the two poles (3,4) of which two coils (5,6) are seated, which in series form the stator winding and the connecting lines
- Each arrow of the double arrow (15) can be the north or
- the stator results in the two opposite locking positions, which, as shown, are a few degrees from the X axis, the polar axis of the
- Stator deviate and thus allow a starting torque.
- FIGS. 1 and 2 there is a good and a poorly starting direction of rotation for each rest position.
- a positive current is applied, then the rotor is rotated a few degrees clockwise in the X direction, a further rotation cannot take place from a static point of view. It is difficult to overcome dead center, especially when there are frictional factors.
- the rotor If, on the other hand, a negative current is applied, the rotor is turned counterclockwise and it can absorb kinetic energy over almost 180 degrees and overcome dead center. In this direction he starts up much better.
- the magnetic field sensors can only be attached at locations where the stator current does not lead to additional signals in the sensor, since it is not otherwise possible to draw conclusions about the position of the rotor.
- the location of the Hall sensor (10) shown in Fig.l and 2 is such a neutral place.
- the control unit cannot use the magnetic field sensor to determine in which direction the rotor can start up.
- the starting process is therefore carried out in such a way that the electronic switch (11) switches the supply voltage to the coil connections 7, 8 after a delay time, the phase gating time, in such a way that a torque results in the desired direction of rotation and after the current has dropped to zero separates from it again.
- the delay time is at the first
- the delay time is then reduced until a predetermined maximum current is reached, which is also still below the demagnetizing current.
- This process is repeated until the rotor has rotated around this predefined value.
- ignition limits are determined after every half rotation of the rotor. These consist of a first and a second amplitude value of the magnetic field sensor signal.
- the delay time for the phase control is started with every zero crossing of the supply voltage.
- the electronic switch (11) connects the supply voltage to the stator coils (5,6) if the corresponding polarity of the supply voltage half-wave is present, the amplitude of the magnetic field sensor is within the ignition limits and the time derivative of the magnetic field sensor signal has the correct polarity, ie a driving torque is to be expected.
- the electronic switch (11) Before the electronic switch (11) connects the stator coils to the supply voltage, it is additionally checked whether the maximum of the following current pulse occurs in a rotor position in which the field vector of the stator field is directed against the field vector of the rotor magnet and thus has a demagnetizing effect. If this is the case, the delay time is extended and the current is reduced to a non-hazardous value.
- the delay time for the leading edge is reduced in steps when starting up if the synchronous speed has not yet been reached and increased if it has been exceeded. In this way, load-dependent control of the acceleration current is achieved in a simple manner.
- phase difference between the signal of the magnetic field sensor and that of the current is regulated via the delay time for the phase gating in such a way that maximum efficiency results. This is the case with the arrangement described here if the phase difference is regulated to zero.
- a load and voltage adjustment is thus available which keeps the power loss and thus the motor size and the manufacturing costs small.
- This situation is determined by comparing the magnitude of the phase angle between the motor current and the magnetic field signal with a predefined value and switching on the control laws of the startup when exceeded. If the rotor is blocked, for example if a corresponding foreign body gets into the pump wheel, the rotor will no longer turn and rebound. In this case, the maximum amplitude of the magnetic field signal is significantly smaller than that in normal operation. This criterion is used to replace the currently applicable control laws for acceleration or synchronous operation with those for startup, thus preventing damage to the motor from incorrectly acting currents.
- a measure of the operating power of the motor is obtained in a simple manner by the selected type of control in synchronous operation in such a way that the peak value of the current pulses is determined and multiplied by the cosine of the phase angle between the current and magnetic field signals or an approximation thereof.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Motor And Converter Starters (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98906827A EP0954901A1 (fr) | 1997-01-21 | 1998-01-21 | Commande du demarrage et du fonctionnement d'un moteur synchrone monophase a rotor a aimantation permanente, y compris en cas de panne |
SK978-99A SK282397B6 (sk) | 1997-01-21 | 1998-01-21 | Spôsob spúšťania a prevádzkovej regulácie jednofázového synchrónneho motora s rotorom s permanentnými magnetmi aj s prihliadnutím na poruchové stavy |
US09/341,945 US6239563B1 (en) | 1997-01-21 | 1998-01-21 | Electronic starting and operating control system for a single-phase synchronous motor with a permanent magnetic rotor, also in case of failure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19701856A DE19701856A1 (de) | 1997-01-21 | 1997-01-21 | Elektronische Anlauf und Betriebssteuerung für einen Einphasen-Synchronmotor |
DE19701856.4 | 1997-01-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998032214A1 true WO1998032214A1 (fr) | 1998-07-23 |
Family
ID=7817853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/000172 WO1998032214A1 (fr) | 1997-01-21 | 1998-01-21 | Commande du demarrage et du fonctionnement d'un moteur synchrone monophase a rotor a aimantation permanente, y compris en cas de panne |
Country Status (6)
Country | Link |
---|---|
US (1) | US6239563B1 (fr) |
EP (1) | EP0954901A1 (fr) |
DE (1) | DE19701856A1 (fr) |
SK (1) | SK282397B6 (fr) |
TR (1) | TR199901745T2 (fr) |
WO (1) | WO1998032214A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1637890A1 (fr) | 2004-09-01 | 2006-03-22 | Wilo Ag | Procédé pour la détermination sans contact de la vitesse d'un moteur électrique |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001045235A1 (fr) * | 1999-12-17 | 2001-06-21 | MONEGO, Guido | Moteur electrique a aimants permanents et commande electronique |
DE10028492B4 (de) * | 2000-06-08 | 2008-09-25 | Ebm-Papst Mulfingen Gmbh & Co. Kg | System zum Steuern eines netzgeführten Wechselstrom-Synchronmotors |
DE10207549B4 (de) * | 2002-02-22 | 2004-05-06 | Aradex Ag | Verfahren und Vorrichtung zum Betrieb eines Synchronmotors |
EP1351376A1 (fr) * | 2002-03-11 | 2003-10-08 | Askoll Holding S.r.l. | Dispositif électronique pour le démarrage et la commande d'un moteur synchrone à aimants permants |
ES2197822B1 (es) * | 2002-06-18 | 2005-09-16 | Fagor, S. Coop. | Dispositivo electronico para el control de un motor sincrono con rotor de iman permanente. |
DE50311997D1 (de) * | 2003-01-21 | 2009-11-19 | Grundfos As | Verfahren zum Steuern des Zündwinkels und einphasiger wechselstromversorgter Elektromotor |
DE10308090B4 (de) * | 2003-02-24 | 2005-12-22 | Hanning Elektro-Werke Gmbh & Co. Kg | Synchronmotor mit Anlaufeinrichtung |
DE60310929T2 (de) * | 2003-09-04 | 2007-10-11 | Askoll Holding S.R.L., Povolaro Di Dueville | Verfahren und Vorrichtung zur Bestimmung des hydraulischen Durchflusses in einer Pumpe |
BR0305905A (pt) * | 2003-12-11 | 2005-08-16 | Brasil Compressores Sa | Sistema de partida para motor a indução monofásico |
PL2060000T3 (pl) * | 2006-09-06 | 2012-07-31 | Siemens Ag | Sposób pracy układu silnikowego i układ silnikowy |
US20080116829A1 (en) * | 2006-11-16 | 2008-05-22 | Gerfast Sten R | Efficient AC circuit for motor with like number of poles and magnets |
US8581539B2 (en) * | 2006-11-16 | 2013-11-12 | Sten R. Gerfast | Efficient circuit for brushless low cogging machine with congruent stator |
ES1065745Y (es) * | 2007-06-21 | 2008-01-16 | Coprecitec Sl | Dispositivo de control de una lavadora |
ITTO20070458A1 (it) * | 2007-06-26 | 2008-12-27 | Emerson Appliance Motors Europe | Sistema di controllo della rotazione a regime di un motore elettrico sincrono |
ITTO20070459A1 (it) * | 2007-06-26 | 2008-12-27 | Emerson Appliance Motors Europe | Sistema di controllo senza sensori di posizione per un motore elettrico sincrono |
ITPD20080313A1 (it) * | 2008-10-29 | 2010-04-30 | Newa Tecno Ind S R L | Dispositivo elettronico di avviamento e controllo per motori elettrici sincroni monofase con rotore a magneti permanenti |
FI125117B (fi) * | 2009-11-10 | 2015-06-15 | Kone Corp | Menetelmä hissijärjestelmän yhteydessä, sekä hissijärjestelmä |
EP2410651B1 (fr) * | 2010-07-23 | 2013-06-05 | Askoll Holding S.r.l. | Méthode pour le démarrage d'un Moteur électrique synchrone monophasé à aimant permanent et dispositif électronique de mise en oeuvre dudit procédé |
US11563389B2 (en) * | 2010-07-30 | 2023-01-24 | Danfoss Customised Power Electronics | Method for starting a single-phase induction motor |
US8575873B2 (en) * | 2010-08-06 | 2013-11-05 | Nidec Motor Corporation | Electric motor and motor control |
CN106469958A (zh) * | 2015-08-14 | 2017-03-01 | 德昌电机(深圳)有限公司 | 流体产生装置 |
US10557469B2 (en) * | 2016-03-22 | 2020-02-11 | Whirlpool Corporation | Multi-outlet fluid flow system for an appliance incorporating a bi-directional motor |
GB2549740B (en) * | 2016-04-26 | 2019-04-17 | Dyson Technology Ltd | A method for controlling an electric motor |
CN107465368B (zh) * | 2016-05-30 | 2023-09-26 | 德昌电机(深圳)有限公司 | 电机及其驱动电路与驱动方法 |
CN109687780A (zh) * | 2017-08-25 | 2019-04-26 | 德昌电机(深圳)有限公司 | 电机及其驱动电路与驱动方法 |
CN107911051B (zh) * | 2018-01-05 | 2024-02-23 | 无锡好力泵业有限公司 | 一种单相永磁同步电动机的启动方法及启动电路 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5434491A (en) * | 1992-06-17 | 1995-07-18 | Askoll S.P.A. | Electronic device for starting a synchronous motor with permanent-magnet rotor |
EP0666639A1 (fr) * | 1994-02-03 | 1995-08-09 | Werner Dr. Mühlegger | Procédé et dispositif de démarrage d'une machine synchrone monophasée |
DE19534423A1 (de) * | 1995-09-16 | 1997-03-20 | Wunnibald Kunz | Vorrichtung zur Steuerung des Anlaufs und des Betriebs eines Einphasensynchronmotors mit permanentmagetischem Rotor |
Family Cites Families (4)
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DE3507883A1 (de) * | 1985-03-06 | 1986-09-18 | Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen | Schaltung zur steuerung eines buerstenlosen elektromotors |
DE3517570A1 (de) * | 1985-05-15 | 1986-11-20 | Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen | Schaltung zur steuerung eines buerstenlosen elektromotors |
DE19533344A1 (de) | 1995-09-08 | 1997-03-13 | Aweco Kunststofftech Geraete | Vorrichtung zur Steuerung des Anlaufs und des Betriebs eines Einphasensynchronmotors mit permanentmagnetischem Rotor |
GB9715248D0 (en) * | 1997-07-18 | 1997-09-24 | Switched Reluctance Drives Ltd | Starting of single-phase motors |
-
1997
- 1997-01-21 DE DE19701856A patent/DE19701856A1/de not_active Withdrawn
-
1998
- 1998-01-21 TR TR1999/01745T patent/TR199901745T2/xx unknown
- 1998-01-21 EP EP98906827A patent/EP0954901A1/fr not_active Withdrawn
- 1998-01-21 US US09/341,945 patent/US6239563B1/en not_active Expired - Fee Related
- 1998-01-21 WO PCT/DE1998/000172 patent/WO1998032214A1/fr not_active Application Discontinuation
- 1998-01-21 SK SK978-99A patent/SK282397B6/sk unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5434491A (en) * | 1992-06-17 | 1995-07-18 | Askoll S.P.A. | Electronic device for starting a synchronous motor with permanent-magnet rotor |
EP0666639A1 (fr) * | 1994-02-03 | 1995-08-09 | Werner Dr. Mühlegger | Procédé et dispositif de démarrage d'une machine synchrone monophasée |
DE19534423A1 (de) * | 1995-09-16 | 1997-03-20 | Wunnibald Kunz | Vorrichtung zur Steuerung des Anlaufs und des Betriebs eines Einphasensynchronmotors mit permanentmagetischem Rotor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1637890A1 (fr) | 2004-09-01 | 2006-03-22 | Wilo Ag | Procédé pour la détermination sans contact de la vitesse d'un moteur électrique |
Also Published As
Publication number | Publication date |
---|---|
SK282397B6 (sk) | 2002-01-07 |
EP0954901A1 (fr) | 1999-11-10 |
US6239563B1 (en) | 2001-05-29 |
DE19701856A1 (de) | 1998-07-23 |
SK97899A3 (en) | 1999-12-10 |
TR199901745T2 (xx) | 1999-10-21 |
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